Manufacture of heat-insulating compounds.



unrrnn STATES PATENT canton.-

WILLIAM DAVID ASHTON BOST, OF PAISLiEY, SCOTLAND, ASSIGNOR TO INTERNATIONAL REFRIGERATING INSULATOR SYNDTCATE} LIMITED, 0F PAISLEY, SCOTLAND.

' MANUFACTURE or nEnr-mstiLArrNG comrounns.

No Drawing.

To all whom it may concern.-

Be itlrnown that I, XVILLIAM DAVID Asrr TON Bos'r, a subject of the. King of the United Kingdom of Great Britain and Ir'e land, and residing at Paisley, Renfrewshire, Scotland, have invented a certain new and useful Improvement in the Manufacture of Heat-Insulating Compounds, of which the.

following is a specification.

The uses to which charcoal made from .whole wood can be put are so varied that there is an immense sale for it: whereas the outlets for charcoal anade from sawdust and other small wood, 2'. 0., carbonized wood turnings, shavings, planings and the like, are very restrlcted; and most of the attempts made to deal with such Wood have ended 1n failure on account of the difiieulty of u'tilizing or disposing of the charcoal from this class of Wood. By the present invention it is rendered possible to utilize such charcoal for the productlon of a new and useful material which can be put on the market as a' heat insulating compound. In this respect the invention may be regarded as an improvement on the invention described in Noodts United States patent specification No. M1585. The said compound is by the invention produced from carbonized small,

the pulp in the proportion of four parts by weight of charcoal to one of pulp; and to effect admixture with these ingredients of resinate of alumina of an amount equivalent to 2% or thereabout 0f the total there is preferably added resinate of soda and sul- Specification of Letters Patent.

Patented Nov. 12, 1912.

Application filed August 2, 1910. Serial No. 575,143.

fate of alumina. the sulfate of soda so formed being drawn off. A proportion of ground pitch,]say 20% of the total, may be added to the mixture. For making the paper pulp, broke or waste paper may be use. I

The chief advantages obtained by the present invention as compared with other processes of manufacturing insulating compounds from charcoal and paper pulp are (1) The productof the invention is lighter; and (2) the, expense and trouble of breaking the charcoal into fine pieces are avoided.

While the preferred proportions of the ingredients of the improved composition are specified above,it is to be understood that the proportions may be varied Within the Widestlimits.

What I claim is 1. A composition of matter consisting of paper pulp, carbonized small wood, resinate of alumina and ground pitch.

2. A composition of matter consisting of paper pulp, carbonized sawdust, resinate of alumina and ground pitch.

3. The hereindesoribed improvement in the manufacture of insulating compound consisting in mixing paper pulpv and carbonized small wood withresinate of soda and sulfate of alumina, removing the sodium sulfate so formed, and drying the mixture.

4. The hereindescribed improvement in the manufacture of insulating compound consisting in mixing paper pulp and car bonized saw dust with resinate of soda and sulfate of alumina, removing the sodium sulfate so formed, and drying the mixture.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WILLIAM DAVID ASHTON BOST.

WVitnesses:

VVALLAon CRANsTON FAIRWEATIIER, J OHN MOCLEARY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. 0. 

